def move(n, a, b, c):
	if n==1:
		print(a, "->", c);
	else:
		move(n-1, a, c, b);
		#print(a, "->", c);
		move(1, a, b, c);
		move(n-1, b, a, c);
move(3, "a", "b", "c");

